A high-level surveillance probe of Montreal’s criminal underworld shows that Canada’s federal policing agency has had a global encryption key for BlackBerry devices since 2010.

The revelations are contained in a stack of court documents that were made public after members of a Montreal crime syndicate pleaded guilty to their role in a 2011 gangland murder. The documents shed light on the extent to which the smartphone manufacturer, as well as telecommunications giant Rogers, cooperated with investigators.